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Search Again :: Adv Search 1000 results in 0.014s
<1234567…34>
  • Reading Kempston MouseI have been looking at Velesoft's design for the Kempston Mouse interface and am puzzled over the description for reading port 64223 (the Kempston mo…

    ... the description for reading port 64223 (the Kempston mouse port).

    Velesoft ... page says:
    mouse buttons port 64223/15071:
    ===============================
    D0 ... /reference/peripherals.htm[/url], the port should return:

    ...
    rwap rwap March 2010 Hardware
  • Hardware description - MULTIFACE 3[B]Hardware description - MULTIFACE 3[/B] This is description of MF3 clone, because I can't find more about original interface. Schematic and PAL ch…

    ... disconnect + disabled reading of ports #xx3F(reading of this ports ... In same time is enable reading of ports #xx3F.
    ... + enable MAGIC button + disable reading of ports #xx3F
    OUT ... ) return last data writed to port #3FFD
    - IN #5F3F (addressing ...
    velesoft velesoft August 2013 Hardware
  • Strange keyboard port reads on 48+Hi all, I don't know whether it was already discussed (I also searched forum, but there are too much of results searching "48k keyboard" so I didn't…

    ... on 48k+ keyboard and read port EFFE (keys 6-0) I ... address where is the program reading port as on some addresses it ... test program, which repeatedly reads port EFFE (on different addresses) and ...
    ub880d ub880d January 2015 Hardware
  • Decoding of speccy keyboardHello everyone. I face following problem with spectrum keys decoding and need some explanation. I know how to decode a single key press by reading po…

    ... a single key press by reading port 0xfe (eventually ports from 0xfefe ... /> Deeper explanation of keyboard matrix reading will be really handfull.
    Fikee Fikee April 2008 Development
  • Please test your ZX128+2 (grey model)Please reset your ZX128+2 (grey) and write in 128 basic (or in USR0 mode): [B]PRINT IN 32765[/B] - if basic crash (black screen) then your ZX contai…

    ... HAL10H8 with incorrect firmware (after reading port 32765 your ZX crash)
    reading from port 32765 are ignored, ZX ...
    velesoft velesoft August 2011 Hardware
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... it is due to the port 0xff values being different ... to see screen bytes while reading unused ports. However I ... compatible with the Spectrum. Shame port $ff is also used ... automatically starts with Kempston selected. Reading port $1f, which is unconnected, ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... it is due to the port 0xff values being different than ... ]

    Apologies, I meant port $fe not $ff. This difference ... to see screen bytes while reading unused ports. However I do ... that contain attribute values ala reading port $ff on the Speccy. I ...
    Fred Fred May 2004 Emulators
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... that contain attribute values ala reading port $ff on the Speccy. I ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • Old Source CodeWhilst searching through some old boxes today I came across some printouts of some old m/c programs I did back in the 80's. I obviously couldn't code…

    ... to monitor the outputs to port $3ffd, and here's the commands ...
    icabod icabod March 2006 Development
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... 8 bits used while reading port $fe (the keyboard port) to select key ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • horizontal shmupsare there any speccy horizontal shmups where you freely move your ship (or whatever) pixel-by-pixel except penetrator? (i?m glad to realize, the lack…

    ... /> (*)I'd used a 'border reading' port technique that didn't work ...
    frobush frobush June 2007 Games
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... contention starts at T2. For port IO 0x??FE the contention ... be contended when accessing a port in the range 0x4000 to ... execution of an IO instruction reading port 0x7FFF, whose IO part falls ... then the same instruction but reading port 0x00FF.
    The first ...
    csmith csmith September 2007 Emulators
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... ].

    [1] In theory, reading port 0xbffd should split these very ...
    Philip Kendall Philip Kendall March 2009 Development
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... reference and it looks that reading port 65539 could work as software ...
    Fikee Fikee November 2009 Emulators
  • Reading Kempston MouseI have been looking at Velesoft's design for the Kempston Mouse interface and am puzzled over the description for reading port 64223 (the Kempston mo…

    ... the description for reading port 64223 (the Kempston mouse port).

    Velesoft ... page says:
    mouse buttons port 64223/15071:
    ===============================
    D0 ... /reference/peripherals.htm[/url], the port should return:

    ...
    velesoft velesoft March 2010 Hardware
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... e.g. read from port 0x1f instead of 0xed for ... enabled (which sits on port 31), the game is ... as many games do) by reading port 31 near the start of ... it can then read port 31 during the main ... floating bus value) for the port reads. The kempston interface ...
    ccowley ccowley August 2011 Emulators
  • Need for low budget Kempston joystick interfaces?I am thinking of designing a lowcost (< ?10) Kempston joystick interface. Small, one (double sided) board, throughput edge. Others need some too?

    ... joystick is read, and that reading port $00FEh will read the joystick ...
    mcleod_ideafix mcleod_ideafix December 2011 Hardware
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... this game use reading from port 255(#FF) = "attribute port". Is runable only ... on ZX models with readable port 255 = ZX48,ZX128,ZX128+ ... +2A/+3 but not use reading port 255 (screen sync) and game ... can be modified for attribute port support, but this is hardware ...
    velesoft velesoft January 2012 Games
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ...
    Your kemspton joystick port adressation is :
    000xxxxx
    port + AY port for reading and both devices ... time. (for example is reading port FFDF is detected then can ... if AY port is readed (or disable AY reading if kempston ...
    velesoft velesoft December 2012 Hardware
  • Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]

    ... reading of paging port.

    Existing ZX software not support reading of port ... 3 models ignore reading of paging port, here is ... part of software using reading of port 7FFD/1FFD, for ... true value of port 7FFD. This enable true reading port paging port.
    velesoft velesoft March 2013 Hardware
  • Timex 2048 + Interface 2When playing with ZXC3 cartridge (very nice piece of HW from Paul - highly recommended), I connected original Sinclair IF2 to TC2048 and... no joysti…

    ... ]
    The conflict comes when reading port #F4 and #F6 software Timex ... would not, if you use port #FE. But very often, programmers ...
    Black_Cat Black_Cat May 2013 Hardware
  • Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…

    ... will wait for that directly reading port of keyboard)
    5) after ...
    Shaos Shaos August 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... ld a,0x7f ; read port 0x7ffe (7T)
    in ... ld a,0x7f ; read port 0x7ffe (7T)
    in ... in a,(c) ; read port (12T)
    add a ... the C register for reading port 0xFE, I no ...
    stephenw32768 stephenw32768 August 2013 Development
  • Hardware description - MULTIFACE 128I make schematic of MULTIFACE 128 (v36) from PCB layers downloaded from WOS. But all PCB layers on WOS contain some bugs, absent signals, etc.. Now …

    ... disconnect + disable reading of ports #BF(reading of this ports ... ZX rom). Reading data from this port is unused/not ... OUT #7FFD (addressing 0xxxxxxx xxxxxx0x) - port decoding is same as in ... bug and port data are rewrited also after reading port 7FFD).
    velesoft velesoft September 2013 Hardware
  • The SAM CoupeDoes anyone own one of these? I remember being jealous of a friend who bought one of these machines which had a disk that made the system compatible …

    Hi! Tell me, what will be the status of bits D6, when reading port #FFFE, when there is no signal tape recorder?
    Black_Cat Black_Cat September 2013 Hardware
  • The SAM CoupeDoes anyone own one of these? I remember being jealous of a friend who bought one of these machines which had a disk that made the system compatible …

    [QUOTE=Black_Cat;724550]Hi! Tell me, what will be the status of bits D6, when reading port #FFFE, when there is no signal tape recorder?[/QUOTE]

    Theoretically log.1, but I can test in also on real SAM COUPE computer. During some days.
    velesoft velesoft September 2013 Hardware
  • The SAM CoupeDoes anyone own one of these? I remember being jealous of a friend who bought one of these machines which had a disk that made the system compatible …

    ... the status bits D6, when reading port #xxFE, if #xx < #FF ...
    Black_Cat Black_Cat September 2013 Hardware
  • The SAM CoupeDoes anyone own one of these? I remember being jealous of a friend who bought one of these machines which had a disk that made the system compatible …

    ... the status bits D6, when reading port #xxFE, if #xx < #FF ...
    velesoft velesoft September 2013 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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